Tool to generate permutations of items. In Mathematics, a permutation is an arrangement of distinct items in various orders 123,132,213,231,312,321.
Permutations - dCode
Tag(s) : Combinatorics
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Item permutations consist in the list of all possible arrangements and ordering of elements in any order.
Example: The three letters A,B,C can be shuffled (anagrams) in 6 ways: A,B,C B,A,C C,A,B A,C,B B,C,A C,B,A
Having a repeated item involves a division of the number of permutations by the number of permutations of these repeated items.
Example: DCODE 5 letters have $ 5! = 120 $ permutations but contain the letter D twice (these $ 2 $ letters D have $ 2! $ permutations), so divide the total number of permutations $ 5! $ by $ 2! $: $ 5!/2!=60 $ distinct permutations.
Permutations make exponential values which need huge computing servers with huge memory cells, so the generation are not free.